How To Keep Clay Supports From Sticking In Sculpture?

I'm trying out some sculpture, and many of the resources use clay supports to hold up arms and things to help support their weight. They state that these will remain intact through the bisque firing. My question is, how do you keep the arm from sticking to the support? Obviously you wouldn't score and slip and not even press down on the piece, but it seems like they would stick together a little bit. If this happens is there a way to separate them without breaking the piece?